Bionic shale inhibitor and preparation method thereof and drilling fluid

Inactive Publication Date: 2016-08-11
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]To overcome the drawbacks of unsatisfactory shale inhibitor performance and environmental hazard in existing drilling fluids in the prior art, the present subject matter provides a bionic shale i

Problems solved by technology

Maintaining the stability of well walls of bored walls is a world-wide problem in the well drilling industry, and that problem exists in many oil fields in the world, and has not been solved well up to now.
As the target of oil and gas exploration and development in China is further turned to unconventional resources such as deep-seated oil and gas resources, coal-seam gas reservoirs, and shale gas reservoirs under complex geological conditions, the well wall stability problem is often encountered in the exploration and drilling process, resulting in lower drilling speed in complex deep wells and horizontal shale gas wells, increased accidents, longer drilling cycle, and higher cost.
That problem has severely affected the exploration and development process in important oil and gas resource replacement regions in China.
Especially, in the oil and gas fields in the western regions in China (e.g., in Sichuan and Chongqing area), the geological conditions are extremely complex, and complex accidents, such as well wall collapse, well leakage, diameter shrinkage, jamming of drilling tools, logging blocking, and low cementing quality, etc., may occur easily at locations where the formation is high and steep, the strata are fractured, or the well traverses clay shale

Method used

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  • Bionic shale inhibitor and preparation method thereof and drilling fluid
  • Bionic shale inhibitor and preparation method thereof and drilling fluid
  • Bionic shale inhibitor and preparation method thereof and drilling fluid

Examples

Experimental program
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example 1

[0046]This example is provided to describe the bionic shale inhibitor and the method for preparation of the bionic shale inhibitor in the present subject matter.

[0047]Stir and mix 0.5 mol (87.1 g) L-arginine and 0.2 mol (29.2 g) L-lysine at 195° C., add 1.75 mol (171.5 g) phosphoric acid (85 wt. % phosphoric acid aqueous solution), and hold for 16 h at 195° C. for reaction. Add 200 g water when the temperature drops to about 120° C. after the reaction is completed, and continue stirring for 20 min., so that the product is completely dissolved in water. Then, take out the reaction product (water solution) and dry it at about 120° C. to obtain a solid product, dissolve the solid product in dimethyl sulfoxide, and separate the insoluble substances from the solution by suction filtration. Next, evaporate the solution by rotary evaporation; thus, 91.8 g bionic shale inhibitor disclosed in the present subject matter is obtained. Measured by gel permeation chromatography, the weight-averag...

example 2

[0048]This example is provided to describe the bionic shale inhibitor and the method for preparation of the bionic shale inhibitor in the present subject matter.

[0049]Stir and mix 0.8 mol (139.4 g) L-arginine and 0.2 mol (29.2 g) L-lysine at 200° C., add 0.35 mol (34.3 g) phosphoric acid (85 wt. % phosphoric acid aqueous solution), and hold for 8.5 h at 200° C. for reaction. Add 200 g water when the temperature drops to about 120° C. after the reaction is completed, and continue stirring for 20 min., so that the product is completely dissolved in water. Then, take out the reaction product (water solution) and dry it at about 120° C. to obtain a solid product, dissolve the solid product in dimethyl sulfoxide, and separate the insoluble substances from the solution by suction filtration. Next, evaporate the solution by rotary evaporation; thus, 145.8.8 g bionic shale inhibitor disclosed in the present subject matter is obtained. Measured by gel permeation chromatography, the weight-av...

example 3

[0050]This example is provided to describe the bionic shale inhibitor and the method for preparation of the bionic shale inhibitor in the present subject matter.

[0051]Stir and mix 0.8 mol (139.4 g) L-arginine and 0.3 mol (43.9 g) L-lysine at 215° C., add 0.45 mol (44.1 g) phosphoric acid (85 wt. % phosphoric acid aqueous solution), and hold for 9 h at 215° C. for reaction. Add 200 g water, and continue stirring for 20 min., so that the product is completely dissolved in water. Then, take out the reaction product (water solution) and dry it at about 120° C. to obtain a solid product, dissolve the solid product in dimethyl sulfoxide, and separate the insoluble substances from the solution by suction filtration. Next, evaporate the solution by rotary evaporation; thus, 158.4.8 g bionic shale inhibitor disclosed in the present subject matter is obtained. Measured by gel permeation chromatography, the weight-average molecular weight Mw is 2,480 g / mol, and the molecular weight distributio...

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Abstract

The present invention discloses a bionic shale inhibitor, consisting of structural units denoted by formula (1) and structural units denoted by formula (2), wherein, the molar ratio of the structural units denoted by formula (1) to the structural units denoted by formula (2) is 0.2-6:1, and the weight-average molecular weight of the shale inhibitor is 800-4,000 g/mol. The present invention further provides a method for preparation of a bionic shale inhibitor. The present invention further provides a drilling fluid containing the bionic shale inhibitor. The bionic shale inhibitor disclosed in the present invention has high shale inhibition capability, and is environment-friendly and pollution-free.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to Chinese Patent Application No. 201510064987.8 filed on Feb. 6, 2015 and entitled “BIONIC SHALE INHIBITOR AND PREPARATION METHOD THEREOF, AND DRILLING FLUID AND USE THEREOF”, the entire content of which is fully incorporated here by reference.FIELD OF THE INVENTION[0002]The present subject matter relates to a bionic shale inhibitor, a method for preparation of the shale inhibitor and a drilling fluid.BACKGROUND OF THE INVENTION[0003]Maintaining the stability of well walls of bored walls is a world-wide problem in the well drilling industry, and that problem exists in many oil fields in the world, and has not been solved well up to now. As the target of oil and gas exploration and development in China is further turned to unconventional resources such as deep-seated oil and gas resources, coal-seam gas reservoirs, and shale gas reservoirs under complex geological conditions, the well wall stability proble...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/52
CPCC09K8/035C09K2208/12C09K8/52C08G69/10C09K8/24C09K8/04
Inventor JIANG, GUANCHENGXUAN, YANGWU, XIANZHUSONG, RANRANCHEN, JUNBINWANG, XIOUYANG, WEILUO, TAOTAOWANG, LAN
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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